Frequently Asked Questions

Allin PDF (also known as PDF万能王) is a free online PDF processing platform offering 12+ tools including compress, merge, split, convert (PDF to Word/Excel/PPT), OCR, encrypt, watermark, and AI Document Restore. Most features run locally in your browser using WebAssembly.

Yes. Basic features (compress, merge, split, image-to-PDF, encrypt, watermark, reorder) are completely free with no registration. Advanced features like PDF-to-Word and AI Document Restore have daily limits for free users. Pro subscription ($9.99/month or $59.99/year) removes all limits.

Web app (app.allinpdfapp.com) works in any modern browser. iOS native app on App Store. Android app in development. The web app supports PWA mode for offline use.

No account needed for local features (compress, merge, split, encrypt, watermark). Google login required for cloud features (PDF-to-Word, AI Restore) to track usage quotas.

Most tools process files entirely in your browser — files NEVER leave your device. Only PDF-to-Word/Excel/PPT conversion, Office-to-PDF, and AI Document Restore require cloud processing. For these, files are encrypted during transfer and deleted immediately after.

WebAssembly (Wasm) allows complex code to run at near-native speed in browsers. PDF operations happen entirely on your device — no network transfer, no server storage, zero privacy risk, instant processing regardless of internet speed.

For sensitive documents, use only local features (compress, merge, split, encrypt, watermark) — these never transmit your file. Avoid cloud features for highly confidential documents. PDF Encrypt adds AES-256 protection locally.

After initial page load: compress, merge, split, encrypt, watermark, reorder, image-to-PDF, and PDF-to-image all work offline. The web app supports PWA installation for reliable offline access. Cloud features (format conversion, AI restore) always need internet.

Free: 5MB per file. Pro: 50MB per file. These apply to both local and cloud features. Native apps offer higher limits for large files.

Input: PDF, Word (.doc/.docx), Excel (.xls/.xlsx), PowerPoint (.ppt/.pptx), images (JPG/PNG/WebP). Output: PDF, Word (.docx), Excel (.xlsx), PowerPoint (.pptx), images (PNG), plain text (TXT from OCR).

AI Document Restore uses Gemini/GPT-4o/Claude multimodal AI to remove handwritten content from scanned documents (exam papers, forms) while preserving printed text. Processing takes 5-10 seconds per page and requires internet.

Over 95% accuracy on standard printed papers with handwritten answers. Best when printed text is clear, handwriting is in dark ink, and scan quality is 300 DPI or higher.

Pro ($9.99/month or $59.99/year — save 50%): unlimited conversions, AI Restore (50 pages/day), 50MB max file size, PDF encrypt/watermark, OCR, batch processing, priority speed.

Yes. Cancel anytime, keep Pro access until end of billing period. No refunds for partial periods. App Store subscriptions managed via iPhone Settings > Apple ID > Subscriptions.

All modern browsers with WebAssembly: Chrome 57+, Firefox 52+, Safari 11+, Edge 16+, and Chromium-based browsers (Brave, Opera). Mobile browsers (Chrome Android, Safari iOS) fully supported. No Internet Explorer.

Yes. The web app is fully responsive. For best mobile experience, we also have a native iOS app with optimized interface and camera scanning. Android native app in development.